[Boatanchors] [Milsurplus] "Blue Glow" mystery.

[Ian Wilson]

David - are you sure there is *no* current flowing? Would only take a
microamp or so to produce enough X-rays to excite a visible process
in the glass, I would imagine.

73, ian K3IMW



On Mon, Apr 21, 2014 at 8:40 AM, David Stinson <arc5 at ix.netcom.com> wrote:

>    The dark blue glow that seems to be right at the glass
>> is caused by x-rays from the tube.  Its commonly seen in
>> tubes like audio output tubes with fairly high voltage on
>> the plates. Some older tubes had a black coating on the
>> inside of the glass to stop it.
>>
>
> That's my big question and point.
> You are of course correct about the blue glow,
> but why is this one happening in a cut-off tube
> with no current flow, then disappearing when current is flowing?  That's
> opposite of what
> I've seen before.
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>